If high-atomic-number atom is introduced into in a pi-electron system, it enhances phosphorescence & decreases?
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FLUORIMETRY Ppt Presentation - Author Stream
The halogen substituents tend to decrease the fluorescence and ... of fluorescence is found to be directly proportional to the number of ... pi-bonds is found to be enhanced by electron donating groups e.g., ... heavy atoms while phosphorescence increases due to the presence of heavy atoms in the solvent. |
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A dual-emissive-materials design concept enables tumour hypoxia ...
Heavy-atom substitution2 alone increases phosphorescence by a given, ... If you require assistance ... that is, a high probability of electronic transition between singlet and triplet ... or large-atomic-number metals have been incorporated into ... chain decreases (17.6–2.7 kDa) presumably owing to enhanced ... |
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A Recent Review on Chemiluminescence Reaction, Principle and ...
Introduction ... In fluorescence and phosphorescence, the electronically excited state is ... Figure 1: Jablonski diagram describing the electronic levels of ... .. In some cases, these changes will favor CL (if decreases relative to ) and in ... Solvents containing atoms of high atomic number (e.g., alky iodide or ... |
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Patent EP1325671B1 - Organometallic compounds and emission ...
The present invention is directed to phosphorescence based organic ... Phosphorescence can be enhanced over fluorescence by confining, preferably through bonding, the organic molecule in close proximity to an atom of highatomic number. ... It would be desirable if more efficient electrophosphorescent ... |
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Patent US7674531 - Phosphorescent organic light emitting devices ...
The present invention relates to an organic light emitting device ... a phosphorescent material, a second electron transporting layer (ETL), and a cathode. ... R1 to R8 are, independently, a hydrogen atom, an aryl group or an alkyl group. ... .. bidentate ligands and M is a metal of atomic number greater than 40 ... |
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Electronic Spectroscopy: Theory - Chemwiki
Fluorescence differs from phosphorescence in that the electronic energy ... Introduction ... The simple kind of fluorescence is by dilute atomic vapors. ... would be if a 3s electron of a vaporized sodium atom is excited to the 3p state by ... . Low temperature and high viscosity leads to enhanced fluorescence ... |
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Photochemistry - Michigan State University
It is termed phosphorescence if it occurs slowly by way of other excited states. 3. ... transition or by collisional activation, the molecule may cleave into two X• atoms. ... Transitions between electronic states often occur to higher vibrational levels which ... . sigma bond, and the shorter bond distance will enhance the pi- bonding. |